Math Question
![Solve the proportion.
\[
\begin{array}{c}
\frac{r}{81}=\frac{1}{9} \\
r=[?]
\end{array}
\]](https://d3hlidq5bf9vg0.cloudfront.net/app-server-student/2022/1/17/3c1f441b-7ee3-48e6-9bef-e7d4f2c3ee0c.png "Solve the proportion.
\[
\begin{array}{c}
\frac{r}{81}=\frac{1}{9} \\
r=[?]
\end{array}
\]")
Solution
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